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[java]代码库

[java]代码库
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package org.crazyit.viewer;
 
import java.awt.event.ActionEvent;
import java.util.HashMap;
import java.util.Map;
 
import javax.swing.AbstractAction;
import javax.swing.ImageIcon;
 
import org.crazyit.viewer.action.Action;
 
/**
 * 工具栏的Action类
 *
 * @author yangenxiong yangenxiong2009@gmail.com
 * @author Kelvin Mak kelvin.mak125@gmail.com
 * @version  1.0
 * <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
 * <br>Copyright (C), 2009-2010, yangenxiong
 * <br>This program is protected by copyright laws.
 */
public class ViewerAction extends AbstractAction {
    private String actionName = "";
    private ViewerFrame frame = null;
     
    //这个工具栏的AbstractAction所对应的org.crazyit.viewer.action包的某个Action实全
    private Action action = null;
 
    /**
     * 构造器
     *
     */
    public ViewerAction() {
        // 调用父构造器
        super();
    }
 
    /**
     * 构造器
     *
     * @param icon
     *            ImageIcon 图标
     * @param name
     *            String
     */
    public ViewerAction(ImageIcon icon, String actionName, ViewerFrame frame) {
        // 调用父构造器
        super("", icon);
        this.actionName = actionName;
        this.frame = frame;
    }
 
    /**
     * 重写void actionPerformed( ActionEvent e )方法
     *
     * @param e
     *            ActionEvent
     */
    public void actionPerformed(ActionEvent e) {
        ViewerService service = ViewerService.getInstance();
        Action action = getAction(this.actionName);
        //调用Action的execute方法
        action.execute(service, frame);
    }
     
    /**
     * 通过actionName得到该类的实例
     * @param actionName
     * @return
     */
    private Action getAction(String actionName) {
        try {
            if (this.action == null) {
                //创建Action实例
                Action action = (Action)Class.forName(actionName).newInstance();
                this.action = action;
            }
            return this.action;
        } catch (Exception e) {
            return null;
        }
    }
     
     
}